/*
 * Copyright (C) 2015-present, osfans
 * waxaca@163.com https://github.com/osfans
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.osfans.trime;

import android.content.Context;

import java.util.List;

/**
 * 管理多個{@link Keyboard 鍵盤}
 */
class KeyboardSwitch {

    private final Context context;

    private Keyboard[] mKeyboards;
    private List<String> mKeyboardNames;
    private int currentId, lastId, lastLockId;
    private int currentDisplayWidth;

    public KeyboardSwitch(Context context) {
        this.context = context;
        currentId = -1;
        lastId = 0;
        lastLockId = 0;
        reset(context);
    }

    public void reset(Context context) {
        mKeyboardNames = Config.get(context).getKeyboardNames();
        int n = mKeyboardNames.size();
        mKeyboards = new Keyboard[n];
        for (int i = 0; i < n; i++) {
            mKeyboards[i] = new Keyboard(context, mKeyboardNames.get(i));
        }
        setKeyboard(0);
    }

    public void setKeyboard(String name) {
        int i = 0;
        if (isValidId(currentId)) i = currentId;
        if (Function.isEmpty(name)) {
            if (!mKeyboards[i].isLock()) i = lastLockId; //不記憶鍵盤時使用默認鍵盤
        } else if (name.contentEquals(".default")) {
            i = 0;
        } else if (name.contentEquals(".prior")) { //前一個
            i = currentId - 1;
        } else if (name.contentEquals(".next")) { //下一個
            i = currentId + 1;
        } else if (name.contentEquals(".last")) { //最近一個
            i = lastId;
        } else if (name.contentEquals(".last_lock")) { //最近一個Lock鍵盤
            i = lastLockId;
        } else if (name.contentEquals(".ascii")) { //英文鍵盤
            String asciiKeyboard = mKeyboards[i].getAsciiKeyboard();
            if (!Function.isEmpty(asciiKeyboard)) i = mKeyboardNames.indexOf(asciiKeyboard);
        } else {
            i = mKeyboardNames.indexOf(name); //指定鍵盤
        }
        setKeyboard(i);
    }

    private boolean isValidId(int i) {
        return i >= 0 && i < mKeyboards.length;
    }

    private void setKeyboard(int i) {
        if (!isValidId(i)) i = 0;
        lastId = currentId;
        if (isValidId(lastId)) {
            if (mKeyboards[lastId].isLock()) lastLockId = lastId;
        }
        currentId = i;
    }

    public void init(int displayWidth) {
        if ((currentId >= 0) && (displayWidth == currentDisplayWidth)) {
            return;
        }

        currentDisplayWidth = displayWidth;
        reset(context);
    }

    public Keyboard getCurrentKeyboard() {
        return mKeyboards[currentId];
    }

    public boolean getAsciiMode() {
        return getCurrentKeyboard().getAsciiMode();
    }
}
